To expand on my question.I need to replace a 5 band 100k resistor and possibly others but the resistors that I have in my stock of parts for replacements are physically larger than the ones on the current PCB project. Can I use these as replacements? How does the physical size of resistors factor in, or does the size even factor into these components? Further details to describe resistor.The main body colour of both resistors are blue.
For DC and even up to high-frequency AC, the issues are typically only mechanical, not electrical.
However, for very high-frequency AC (VHF or UHF radio frequencies), there may be other factors to consider like bulk capacitance and lead inductance, etc.
So this question/answer doesn't hold up across the entire spectrum. Since we don't know the nature of the circuit, be aware that this is not a 100% universal answer.
Size is not that important (when the replacement part is bigger) but it's a 5-band resistor so make sure that you have a resistor of equivalent tolerance (probably +/-1%) or better and temperature coefficient.
If you replace a precision resistor with, say, a carbon film or composition type the stability of the circuit over temperature and time will likely be greatly compromised.
Resistors are so cheap you might as well just order the correct thing. If it's a 1% resistor replace it with a 1% or better part of the same value and size, and 50ppm/°C or 100ppm/°C. For example, a Stackpole RNMF14FTC100K is about 10-12 cents in single quantity.